package com.add;


import java.util.concurrent.CountDownLatch;

/**
 * CountDownLatch是一个减法锁存器
 */

public class CountDownLatchDemo {

    public static void main(String[] args) throws InterruptedException {

        CountDownLatch countDownLatch = new CountDownLatch(6);  //总数是6

        for (int i = 0; i < 6; i++) {
            new Thread(() -> {
                System.out.println(Thread.currentThread().getName() + "->Go out");
                countDownLatch.countDown();  //倒计时，总数-1
            }, i + "").start();
        }

        countDownLatch.await();  //等待计数器归零，然后再向下执行

        System.out.println("关门");

    }
}
